untreated

adjective

un·​treat·​ed ˌən-ˈtrē-təd 

: not treated

untreated wastewater

especially : not improved or controlled medically

an untreated case of pneumonia

untreated diabetic patients

Synonyms

• crude
• native
• natural
• raw
• rude
• undressed
• unprocessed
• unrefined

Examples of untreated in a Sentence

untreated wool

Recent Examples on the Web

The untreated ectopic pregnancy resulted in one of her fallopian tubes rupturing. —Vanessa Etienne, People.com, 6 June 2025

While most ovarian cysts are completely harmless, there is a small chance that complications could arise if larger cysts are left untreated. —Caroline C. Boyle, USA Today, 4 June 2025

Some of these infections stop on their own, but others are too stubborn, or too serious, to leave untreated. —Sam Walters, Discover Magazine, 4 June 2025

Among the potential consequences of untreated body dysmorphia: anxiety, extensive medical bills, severe depression and suicidal thoughts and behaviors. —Scott Lafee, San Diego Union-Tribune, 3 June 2025

Word History

First Known Use

15th century, in the meaning defined above

Rhymes for untreated

• accreted
• competed
• completed
• conceited
• concreted
• defeated
• deleted
• depleted
• entreated
• intreated
• maltreated
• mistreated

Medical Definition

untreated

adjective

un·​treat·​ed -ˈtrēt-əd 

: not subjected to treatment

an untreated disease